Luján is best known for its large neo-gothicBasilica, built in honor of the Virgin of Luján, the patron saint of Argentina. Every year, more than six million people make pilgrimages to the Basilica,[1] many walking there from Buenos Aires. The city is known as La Capital de la Fe (Capital of the Faith). It is popular day-trip for non-believers too, with abundant grill restaurants (like most places in Argentina) and souvenir shops with kitsch religious memorabilia.

The church was designed by the French architect Ulderico Courtois and started in 1889, completed by 1937. Its towers stand 106m high and it has a copper roof and bronze doors. The huge church towers over the surrounding flat country and houses the tiny 38 cm high statue of the Virgin. A large and important organ by French builder Cavaille-Coll stands in the gallery in a state of deterioration, although efforts are underway to see to its restoration.[2]

The nearby city of Mercedes is seat of the Bishop of Mercedes and Luján. Luján is the principal settlement of the Lujan Partido or municipality. The city has a railway and bus station and is easily reached from Buenos Aires.